Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c9f70b3d612e27…

MALICIOUS

PDF

77.2 KB Created: 2021-09-15 00:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30d6f90f2e0979c09b4cfe2ef7c8880d SHA-1: f3e7881841e601b437fd3298f79922086be742d1 SHA-256: 09c9f70b3d612e272f3eaecc30437a47cfd896185816a6320cdec790ac66301a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tks-forever.com/upload/2021/09/11/file/xizadekogugopazazu.pdf In PDF document text
    • http://geteffective.biz/uploadfiles/file/84713892912.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/bemezozegininigowe.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/gelasedaxarugorufokakeka.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6990d92---46261859163.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/51106879042.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/bokek.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/74991132865.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/ziserimerusuv.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jujisamesorewe.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/73434434211.pdfIn PDF document text
    • https://norservis.cz/files/files/20750909320.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/60463045413.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/gilifemevalidamob.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210905143136421016gn6kzsikv8jg.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vawupisazukixikibo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6ifh3va3mfr8oabqsse2kidr45/10676440969.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/51454369061.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161324d1405a38---nikutir.pdfIn PDF document text
    • http://jawarakreasi.com/file/kiwelepifizuxidiko.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/zisuborevonuz.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/pozorat.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/68257493854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+marrow+thieves+full+book+pdf+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 19052 bytes
SHA-256: f6e8c3782378ea3733cbd1d1d001ce821d23b043b98f240f46ae34da5d0beeea
font_02_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 11104 bytes
SHA-256: 21358ab08c760c14df342efd0cb96aaf3cc566b62beb9a5c060ad4c39a9c5688

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